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DC power control to maximize battery charging time

  • US 9,007,024 B2
  • Filed: 05/28/2008
  • Issued: 04/14/2015
  • Est. Priority Date: 05/28/2008
  • Status: Expired due to Fees
First Claim
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1. A switch matrix power control system comprising:

  • a plurality of charge switches between a power source and a plurality of batteries;

    a charge control circuit coupled to the plurality of charge switches, wherein the plurality of charge switches is adapted to selectively transfer power from the power source to a corresponding battery from the plurality of batteries;

    a plurality of discharge switches between the plurality of batteries and a load;

    a discharge control circuit coupled to the plurality of discharge switches, wherein the plurality of discharge switches is adapted to selectively transfer power from one or more of the batteries to the load in a fixed order of discharge, wherein each of the batteries starts the transfer of power based on the fixed order independent of a voltage of each of the batteries, and wherein the batteries are restored to a charging state to receive power from the power source through the plurality of charge switches in a fixed order of charge that is reversed from the fixed order of discharge such that the fixed order of charge is also independent of the voltage of each of the batteries;

    a reset circuit coupled to the charge control circuit and the discharge control circuit to generate a periodic reset pulse to periodically open the plurality of discharge switches to stop the discharge from any of the batteries to the load and to periodically close the plurality of charge switches to restore all the batteries to the charging state, wherein after the periodic reset pulse the discharge control circuit determines whether to re-close any of the discharge switches;

    a direct output switch between the power source and the load; and

    an output control circuit coupled to the direct output switch to selectively transfer power from the power source to the load.

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